Have a look at this!
This is our solution to fill the space allocated for a second battery under the bonnet of the Next-Gen Ranger & Everest. Designed for an easy install & purpose built. We used a Delkor HDC27 100 A/H Max dimensions 305L x 172W x 190H to the top in the middle, posts can be higher as they sit off the the side, the washer bottle interferes with the middle which creates this height restriction. see link below. This tray also suits other batteries including lithium, which have a max height of 190mm.
Check out our install video below.